Flip chip adaptor package for bare die

ABSTRACT

A board for connecting a bare semiconductor die with a bond pad arrangement which does not conform to a master printed circuit board with a specific or standardized pin out, connector pad, or lead placement arrangement. The board comprises a printed circuit board including first elements, such as minute solder balls, pins, or bond wires, for making electrical contact between the board and the master board, and second elements, such as minute solder balls, pins, or bond wires, for making electrical contact between the semiconductor die and the board. The board has circuit traces for electrical communication between the board/master board electrical contact elements, and the semiconductor die board electrical contact elements.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 09/483,483,filed Jan. 14, 2000, now U.S. Pat. No. 6,265,766, issued Jul. 24, 2001,which is a continuation of application Ser. No. 08/948,936, filed Oct.10, 1997, now U.S. Pat. No. 6,201,304 B1, issued Mar. 13, 2001, which isa continuation of application Ser. No. 08/574,662, filed Dec. 19, 1995,now U.S. Pat. No. 5,719,440, issued Feb. 17, 1998.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an apparatus for connecting a baresemiconductor die having a size and bond pad arrangement, either solderball arrangement, or pin arrangement (hereinafter referred to generallyas a “terminal arrangement”), which does not conform to a printedcircuit board with a specific or standardized pin out, connector pad, orlead placement (hereinafter referred to generally as a “connectionarrangement”). More particularly, the present invention relates to anintermediate conductor-carrying substrate (hereinafter referred togenerally as an “adaptor board”) for connecting a non-conforming baredie to another printed circuit board having a given connectionarrangement (hereinafter referred to generally as a “master board”).

2. State of the Art

Definitions: The following terms and acronyms will be used throughoutthe application and are defined as follows:

BGA—Ball Grid Array: An array of minute solder balls disposed on anattachment surface of a semiconductor die wherein the solder balls arerefluxed for simultaneous attachment and electrical communication of thesemiconductor die to a printed circuit board.

COB—Chip On Board: The techniques used to attach semiconductor dice to aprinted circuit board, including flip chip attachment, wirebonding, andtape automated bonding (“TAB”).

Flip Chip: A chip or die that has bumped terminations spaced around theactive surface of the die and is intended for facedown mounting.

Flip Chip Attachment: A method of attaching a semiconductor die to asubstrate in which the die is flipped so that the connecting conductorpads on the face of the die are set on mirror-image pads on thesubstrate (i.e. printed circuit board) and bonded by refluxing thesolder.

Glob Top: A glob of encapsulant material (usually epoxy or silicone or acombination thereof) surrounding a semiconductor die in the COB assemblyprocess.

PGA—Pin Grid Array: An array of small pins extending substantiallyperpendicularly from the major plane of a semiconductor die, wherein thepins conform to a specific arrangement on a printed circuit board forattachment thereto.

SLICC—Slightly Larger than Integrated Circuit Carrier: An array ofminute solder balls disposed on an attachment surface of a semiconductordie similar to a BGA, but having a smaller solder ball pitch anddiameter than a BGA.

State-of-the-art COB technology generally consists of threesemiconductor dies to printed circuit boards attachment techniques: flipchip attachment, wirebonding, and TAB.

Flip chip attachment consists of attaching a semiconductor die,generally having a BGA, a SLICC or a PGA, to a printed circuit board.With the BGA or SLICC, the solder ball arrangement on the semiconductordie must be a mirror-image of the connecting bond pads on the printedcircuit board such that precise connection is made. The semiconductordie is bonded to the printed circuit board by refluxing the solderballs. With the PGA, the pin arrangement of the semiconductor die mustbe a mirror-image of the pin recesses on the printed circuit board.After insertion, the semiconductor die is generally bonded by solderingthe pins into place. An under-fill encapsulant is generally disposedbetween the semiconductor die and the printed circuit board to preventcontamination. A variation of the pin-in-recess PGA is a J-lead PGA,wherein the loops of the J's are soldered to pads on the surface of thecircuit board. Nonetheless, the lead and pad locations must coincide, aswith the other referenced flip chip techniques.

Wirebonding and TAB attachment generally begins with attaching asemiconductor die to the surface of a printed circuit board with anappropriate adhesive. In wirebonding, a plurality of bond wires areattached, one at a time, from each bond pad on the semiconductor die andto a corresponding lead on the printed circuit board. The bond wires aregenerally attached through one of three industry-standard wirebondingtechniques: ultrasonic bonding—using a combination of pressure andultrasonic vibration bursts to form a metallurgical cold weld;thermocompression bonding—using a combination of pressure and elevatedtemperature to form a weld; and thermosonic bonding—using a combinationof pressure, elevated temperature, and ultrasonic vibration bursts. Thedie may be oriented either face up or face down (with its active surfaceand bond pads either up or down with respect to the circuit board) forwire bonding, although face up orientation is more common. With TAB,metal tape leads are attached between the bond pads on the semiconductordie and the leads on the printed circuit board. An encapsulant isgenerally used to cover the bond wires and metal tape leads to preventcontamination.

Although the foregoing methods are effective for bonding semiconductordice to printed circuit boards, the terminal arrangements of the diceand the connection arrangements of the boards must be designed toaccommodate one another. Thus, it may be impossible to electricallyconnect a particular semiconductor die to a printed circuit board forwhich the semiconductor die terminal arrangement was not designed tomatch the board's connection arrangement. With either wirebond or TABattachment, the semiconductor die bond pad may not correspond to thelead ends on the circuit board, and thus attachment is either impossibleor extremely difficult due to the need for overlong wires and thepotential for inter-wire contact and shorting. With flip chipattachment, if the printed circuit board connection arrangement is not amirror-image of the solder ball or pin arrangement (terminalarrangement) on the semiconductor die, electrically connecting the flipchip to the printed circuit board is impossible.

Therefore, it would be advantageous to develop an apparatus forconnecting a semiconductor die having a size and bond pad arrangement,solder ball arrangement, or pin arrangement (“I/O pattern”) which doesnot conform to a printed circuit board with a specific or standardizedpin out, connection pad location, or lead placement (“I/O pattern”).

SUMMARY OF THE INVENTION

The present invention relates to an intermediate printed circuit boardor other conductor-carrying substrate that functions as an adaptor boardfor electrically connecting one or more bare semiconductor dice of avariety of sizes and bond pad locations, solder ball arrangement, or pinarrangement, to a master printed circuit board with a specific orstandardized pin out, connector pad location, or lead placement.

An adaptor printed circuit board or substrate (“adaptor board”) is sizedand configured with an I/O pattern to accommodate its attachment to themaster printed circuit board (“master board”). If the master board isconfigured to receive a specific pin out or specific connector padlocations, the adaptor board is configured on its master boardattachment surface with pins or solder balls in mirror-image to themaster board connection arrangement to make electrical contact with thespecific pin out or connector pads on the printed circuit board. If themaster board is configured to receive a bond wire, the adaptor board isconfigured and sized to provide wire bond pads on its upper surfaceclosely adjacent the bond pads of the master board leads. The adaptorboard can, of course, be configured to accommodate other attachment andelectrical connection means known in the industry, as well as othercomponents in addition to the semiconductor die or dice carried thereon.

On the semiconductor die side of the adaptor board, one or moresemiconductor dice are attached. If a “flip chip” die is attached to theadaptor board, the adaptor board will, of course, be configured with anI/O pattern to receive the flip chip with a specific pin out orconnector pad locations. The pin out or connector pads on the adaptorboard are connected to circuit traces on or through the adaptor board.The circuit traces form the electrical communication path from the pinrecesses or connector pads on the adaptor board to the connection pointsto the master board.

If a “leads over” die is used with the adaptor board, the bond pads onthe die are wirebonded to the adaptor board. Preferably, the leads overdie is attached to the adaptor board with the bond pads facing theadaptor board. The bond wires are attached to the leads over die bondpads and extend into a via or vias in the adaptor board. The bond wiresare attached to an I/O pattern of adaptor board bond pads within the viafrom which circuit traces extend, or to leads on the master board sideof the adaptor board.

It is, of course, understood that the leads over die can be attached tothe adaptor board with the bond pads facing away from the adaptor board.Thus, the bond wires are simply attached to the bond pads on the leadsover die and to a corresponding I/O pattern of adaptor board pad on thesemiconductor die side of the adaptor board.

Preferably, the exposed circuitry of the die and the die-to-adaptorboard interconnection is sealed from contamination by a glob top afterwire bonding or an underflow compound in the case of a flip chipattachment.

Furthermore, it is understood that with the use of wire bonds, theadaptor boards can be stacked on top of each other and connected to theadaptor board as by wire bonding.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

While the specification concludes with claims particularly pointing outand distinctly claiming that which is regarded as the present invention,the advantages of this invention can be more readily ascertained fromthe following description of the invention when read in conjunction withthe accompanying drawings in which:

FIG. 1 is a side view of one embodiment of the present invention;

FIG. 2 is a side view of a second embodiment of the present invention;

FIG. 2A is a top view of the second embodiment of the present inventionshown in FIG. 2;

FIG. 3 is a side view of a third embodiment of the present invention;and

FIG. 4 is a side view of a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates a first embodiment of the present inventiondesignated as a flip chip style/flip chip attachment assembly 100.Assembly 100 comprises a semiconductor die 12 having an inverted activesurface 14 with at least one flip chip electric connection 16 (such as aC4 solder bump connection, a pin connection, or a surface mount j-leadconnection, by way of example) extending substantially perpendicularlyfrom a bond pad 15 on the semiconductor die active surface 14. The flipchip electric connections 16 are attached to an upper surface 20 of anadaptor board 18 in such a manner that the flip chip electricconnections 16 make electrical contact with electrical contact elements21 in or on the surface of adaptor board 18. The electrical contactelements 21 make electrical communication between each flip chipelectric connection 16, through circuit traces 23 (exemplary tracesshown in broken lines) in the adaptor board 18, to at least one masterboard connector 22 extending substantially perpendicularly from a lowersurface 24 of the adaptor board 18 to connect adaptor board 18 to analigned terminal 31 on master board 30. Preferably, a sealing compound26 is disposed between the semiconductor die 12 and the adaptor board 18to prevent contamination of the flip chip electric connections 16 and tomore firmly secure semiconductor die 12 to adaptor board 18.

In actual practice, there will be a plurality of terminals 31 arrangedin a specific, perhaps industry-standard pattern, on master board 30,and master board connectors will be arranged in a mirror-image patternto terminals 31 for mating connection therewith. Master board connectors22 and terminals 31 may comprise any electrical connection mechanismknown in the art, in addition to those previously described herein.

FIGS. 2 and 2A illustrate a second embodiment of the present inventiondesignated as a flip chip style/wire bond attach assembly 200.Components common to both FIG. 1 and FIG. 2 retain the same numericdesignation. The assembly 200 comprises the semiconductor die 12 havingactive surface 14 with at least one flip chip electric connection 16, asknown in the art, extending substantially perpendicularly from a bondpad 15 on the semiconductor die active surface 14. The flip chipelectric connections 16 are attached to the adaptor board upper surface20 in such a manner that the flip chip electric connections 16 makeelectrical contact with electrical contact elements 21 on the adaptorboard 18. The electrical contact elements 21 communicate between eachflip chip electric connection 16 to bond pads 28 on the adaptor boardupper surface 20 through circuit traces 23. The adaptor board lowersurface 24 is bonded to an upper surface 36 of a master board 30 with anadhesive 32, which may comprise a liquid or gel adhesive, or an adhesivetape, all as known in the art. If desired, adhesive 32 may be aheat-conductive adhesive. A wire bond 34 extends from each adaptor boardbond pad 28 to a corresponding bond pad or lead end 35 on the uppersurface 36 of master board 30, bond pad or lead end 35 communicatingwith other components mounted to master board 30 or with othercomponents on other boards or other assemblies through circuit traces orother conductors known in the art.

FIG. 3 illustrates a third embodiment of the present inventiondesignated as a wire bond style/flip chip attach assembly 300.Components which are common to the previous figures retain the samenumeric designation. The assembly 300 comprises an invertedsemiconductor die 12 having active surface 14 with at least one bond pad38 on the semiconductor die active surface 14. As illustrated, the bondpads 38 are arranged in two rows extending down the longitudinal axis ofsemiconductor die 12 being located transverse to the plane of the page,such an arrangement commonly being used for a “leads over” connection toframe leads extending over the die in its normal, upright position. Thesemiconductor die active surface 14 is bonded to the adaptor board uppersurface 20 with an insulating, sealing adhesive 40. The adaptor board 18includes at least one wire bond via 42 which is located in a position orpositions aligned with the semiconductor die bond pads 38. Eachindividual wire bond 134 is connected to each corresponding individualsemiconductor die bond pad 38. Each wire bond 134 extends from thesemiconductor die bond pad 38 to a corresponding bond pad or lead 39 onthe adaptor board lower surface 24, which communicates with master boardconnectors 22 through circuit traces 23. The master board terminals 31are in electrical communication with at least one master board connector22 extending substantially perpendicularly from the adaptor board lowersurface 24. Preferably, a sealant 44 encases the bond wires 134 andseals the wire bond via 42 to prevent contamination and damage to thewire bonds.

FIG. 4 illustrates a fourth embodiment of the present inventiondesignated as a wire bond style/wire bond attach assembly 400.Components which are common to the previous figures retain the samenumeric designation. The assembly 400 comprises the semiconductor die 12having active surface 14 with at least one bond pad 38 on thesemiconductor die active surface 14. As with the embodiment of FIG. 3,semiconductor die 12, in this instance, employs bond pads 38 in a “leadsover” configuration. The semiconductor die active surface 14 is bondedto the master board upper surface 20 with an insulating, sealingadhesive 40. The adaptor board 18 includes at least one wire bond via 42which is located in a position or positions aligned with thesemiconductor die bond pads 38. Each individual wire bond 134 isconnected to each corresponding semiconductor die bond pad 38. Each wirebond 134 extends from the semiconductor die bond pad 38 to acorresponding bond pad 46 within the wire bond via 42. The via bond pads46 are in electrical communication through circuit traces 23 with atleast one corresponding adaptor board bond pad 28. The adaptor boardlower surface 24 is bonded to the master board upper surface 36 with theadhesive 32. Wire bonds 34 extend from the master board upper surface 20to a corresponding bond pad or lead on the master board upper surface36. Preferably, the wire bond via sealant 44 encases the bond wires 134and seals the wire bond via 42 to prevent contamination.

Having thus described in detail preferred embodiments of the presentinvention, it is to be understood that the invention defined by theappended claims is not to be limited by particular details set forth inthe above description as many apparent variations thereof are possiblewithout departing from the spirit or scope thereof.

What is claimed is:
 1. A substrate having a plurality of circuitsthereon for connecting a bare semiconductor die having a plurality ofbond pads on a portion of a surface thereof to another substrate, saidsubstrate using a plurality of bond wires to connect the plurality ofbond pads on said bare semiconductor die and the plurality of circuitson said substrate, comprising: a substrate including at least a portionof a printed circuit board having a first die side surface for attachinga portion of the surface having a plurality of bond pads of said baresemiconductor die thereto, a second attachment surface having aplurality of bond pads located thereon for connecting said plurality ofbond wires thereto, at least one via extending therethrough for having aportion of said plurality of bond wires extending therethrough, and aplurality of circuit traces having at least one circuit trace connectedto at least one bond pad of said plurality of bond pads of said secondattachment surface for connecting to said plurality of bond wires forconnecting to said plurality of bond pads of said bare semiconductor dieand for electrically connecting between said bare semiconductor die andsaid another substrate; and at least a portion of a plurality ofelectrical connectors located on the second attachment surface of thesubstrate for electrically connecting said substrate and said anothersubstrate, the at least a portion of a plurality of electricalconnectors for connecting to the plurality of circuit traces.
 2. Thesubstrate of claim 1, wherein the plurality of electrical connectorscomprise a plurality of solder balls.
 3. The substrate of claim 1,wherein the plurality of electrical connectors comprise a plurality ofpins.
 4. The substrate of claim 1, wherein the plurality of circuittraces comprise a plurality of circuit traces having at least onecircuit trace of the plurality of circuit traces having a portionthereof located in the substrate.
 5. The substrate of claim 1, whereinthe plurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located on the second attachment surface of thesubstrate.
 6. The substrate of claim 1, wherein the plurality of circuittraces comprise a plurality of circuit traces having at least onecircuit trace of the plurality of circuit traces having a portionthereof located on the second attachment surface of the substrate and aportion thereof located in the substrate.
 7. The substrate of claim 1,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located on the first die side surface ofthe substrate.
 8. The substrate of claims 1, wherein the plurality ofcircuit traces comprise a plurality of circuit traces having at leastone circuit trace of the plurality of circuit traces having a portionthereof located on the first die side surface of the substrate and aportion located in the substrate.
 9. The substrate of claim 1, where thesubstrate comprises a printed circuit board.
 10. The substrate of claim1, wherein the substrate further includes a plurality of bond padsconnected to the plurality of circuit traces.
 11. The substrate of claim10, wherein the plurality of bond pads are located on the secondattachment surface of the substrate.
 12. The substrate of claim 10,wherein the plurality of bond pads are located on the first die sidesurface of the substrate.
 13. A substrate having a plurality of circuitsfor connecting one or more bare semiconductor die to another substrate,each bare semiconductor die of the one or more bare semiconductor diehaving a plurality of bond pads on a portion of a surface thereof forconnecting to said another substrate, said substrate using a pluralityof bond wires for connecting between the plurality of bond pads on saideach bare semiconductor die of said one or more bare semiconductor dieand said plurality of circuits on said substrate, comprising: amultilayer substrate having a first die side surface for attachingthereto a portion of the surface having a plurality of bond pads of saidone or more bare semiconductor die, a second attachment surface having aplurality of bond pads located thereon for connecting said plurality ofbond wires thereto, one or more vias extending therethrough for saidplurality of bond wires to extend therethrough from said plurality ofbond pads of said one or more bare semiconductor die, and a plurality ofcircuit traces having at least one circuit trace connected to at leastone bond pad of said plurality of bond pads of said second attachmentsurface for connecting said plurality of bond wires connected to saidplurality of bond pads of said one or more bare semiconductor die andfor electrically connecting between said one or more bare semiconductordie and said another substrate; and a plurality of electrical connectorslocated on the second attachment surface of the substrate forelectrically connecting said substrate and said another substrate, theplurality of electrical connectors connected to the plurality of circuittraces.
 14. The substrate of claim 13, wherein the plurality ofelectrical connectors comprise a plurality of solder balls.
 15. Thesubstrate of claim 13, wherein the plurality of electrical connectorscomprise a plurality of pins.
 16. The substrate of claim 13, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located in the substrate.
 17. The substrate ofclaim 13, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the second attachmentsurface of the substrate.
 18. The substrate of claim 13, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located on the second attachment surface of thesubstrate and a portion thereof located in the substrate.
 19. Thesubstrate of claim 13, wherein the plurality of circuit traces comprisea plurality of circuit traces having at least one circuit trace of theplurality of circuit traces having a portion thereof located on thefirst die side surface of the substrate.
 20. The substrate of claim 13,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located on the first die side surface ofthe substrate and a portion located in the substrate.
 21. The substrateof claim 13, wherein the substrate comprises a printed circuit board.22. The substrate of claim 13, wherein the substrate further includes aplurality of bond pads connected to the plurality of circuit traces. 23.The substrate of claim 22, wherein the plurality of bond pads arelocated on the second attachment surface of the substrate.
 24. Asubstrate having a plurality of circuits thereon for connecting aplurality of bare semiconductor die to another substrate, each baresemiconductor of said plurality of bare semiconductor die having aplurality of bond pads on a portion of a surface thereof for connectingto said another substrate, said substrate using a plurality of bondwires for connecting between the plurality of bond pads on saidplurality of bare semiconductor die and a plurality of circuits on saidsubstrate, comprising: a substrate having at least one layer, having afirst die side surface for attaching thereto a portion of the surfacehaving a plurality of bond pads of said plurality of bare semiconductordie, a second attachment surface having a plurality of bond pads locatedthereon for connecting of said plurality of bond wires thereto, aplurality of vias extending therethrough for said plurality of bondwires to extend therethrough from said plurality of bond pads of saidplurality of bare semiconductor die, and a plurality of circuit traceshaving at least one circuit trace connected to at least one bond pad ofsaid plurality of bond pads of said second attachment surface forconnection to said plurality of bond wires connected to said pluralityof bond pads of said plurality of bare semiconductor die and forelectrically connecting between said plurality of bare semiconductor dieand said another substrate; and a plurality of electrical connectorslocated on the second attachment surface of the substrate forelectrically connecting said substrate and said another substrate, theplurality of electrical connectors for connecting to the plurality ofcircuit traces.
 25. The substrate of claim 24, wherein the plurality ofelectrical connectors comprise a plurality of solder balls.
 26. Thesubstrate of claim 24, wherein the plurality of electrical connectorscomprise a plurality of pins.
 27. The substrate of claim 24, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located in the substrate.
 28. The substrate ofclaim 24, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the second attachmentsurface of the substrate.
 29. The substrate of claim 24, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located on the second attachment surface of thesubstrate and a portion thereof located in the substrate.
 30. Thesubstrate of claim 24, wherein the plurality of circuit traces comprisea plurality of circuit traces having at least one circuit trace of theplurality of circuit traces having a portion thereof located on thefirst die side surface of the substrate.
 31. The substrate of claim 24,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located on the first die side surface ofthe substrate and a portion located in the substrate.
 32. The substrateof claim 24, wherein the substrate comprises a printed circuit board.33. The substrate of claim 24, wherein the substrate further includes aplurality of bond pads connected to the plurality of circuit traces. 34.The substrate of claim 33, wherein the plurality of bond pads arelocated on the second attachment surface of the substrate.
 35. Anelectrical assembly for connection to a substrate having a plurality ofcircuits comprising: a bare semiconductor die having a surface having aplurality of bond pads located thereon; a substrate having a die sidesurface, an attachment surface, a via extending through the substratefrom the die side surface to the attachment surface, a plurality ofcircuit traces, and at least one bond pad connected to at least onecircuit trace of said plurality of circuit traces, a portion of thesurface having the plurality of bond pads of said bare semiconductor dieattached to a portion of the die side surface of the substrate; aplurality of wire bonds for extending through the via extending throughthe substrate from the die side surface to the attachment surfacethereof, the plurality of wire bonds for connection to the plurality ofbond pads of the bare semiconductor die and the plurality of circuittraces; and a plurality of electrical connectors located on theattachment surface of the substrate for electrically connecting thesubstrate and another substrate, the plurality of electrical connectorsconnected to the plurality of circuit traces.
 36. The electricalassembly of claim 35, wherein the electrical connection between theattachment surface of the substrate and said another substrate comprisesa plurality of solder balls.
 37. The electrical assembly of claim 35,wherein the electrical connection between the attachment surface of thesubstrate and said another substrate comprises a plurality of pins. 38.The electrical assembly of claim 35, wherein the plurality of circuittraces comprise a plurality of circuit traces having at least onecircuit trace of the plurality of circuit traces having a portionthereof located in the substrate.
 39. The electrical assembly of claim35, wherein the plurality of circuit traces comprise a plurality ofcircuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the attachmentsurface of the substrate.
 40. The electrical assembly of claim 35,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located on the attachment surface of thesubstrate and a portion thereof located in the substrate.
 41. Theelectrical assembly of claim 35, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe die side surface of the substrate.
 42. The electrical assembly ofclaim 35, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the die side surfaceof the substrate and a portion located in the substrate.
 43. Theelectrical assembly of claim 35, wherein the substrate comprises aprinted circuit board.
 44. The electrical assembly of claim 35, whereinthe substrate further includes a plurality of bond pads connected to theplurality of circuit traces.
 45. The electrical assembly of claim 44,wherein the plurality of bond pads are located on the attachment surfaceof the substrate.
 46. The electrical assembly of claim 44, wherein theplurality of bond pads are located on the die side surface of thesubstrate.
 47. The electrical assembly of claim 35, further comprising:a sealant located in a portion of the via in the substrate encasing atleast a portion of the plurality of bond wires.
 48. The electricalassembly of claim 35, further comprising: an adhesive attaching aportion of the surface having a plurality of bond pads of the baresemiconductor die to the die side surface of the substrate having theplurality of bond pads of the bare semiconductor die located in the viaextending through the substrate from the die side surface to theattachment surface of the substrate.
 49. The electrical assembly ofclaim 48, wherein the adhesive comprises a sealing adhesive.
 50. Theelectrical assembly of claim 48, wherein the adhesive comprises anadhesive tape.
 51. An electrical assembly for connection to a substratehaving a plurality of circuits comprising: at least two baresemiconductor die, each bare semiconductor die of the at least two baresemiconductor die having a surface having a plurality of bond padslocated thereon; a substrate having a die side surface, an attachmentsurface, at least two vias extending through the substrate from the dieside surface to the attachment surface, a plurality of circuit traces,and at least one bond pad connected to at least one circuit trace ofsaid plurality of circuit traces, a portion of the surface having theplurality of bond pads of said each bare semiconductor die of the atleast two bare semiconductor die attached to a portion of the die sidesurface of the substrate; a plurality of wire bonds for extendingthrough each via of the at least two vias extending through thesubstrate from the die side surface to the attachment surface thereof,the plurality of wire bonds for connecting the plurality of bond pads ofsaid each bare semiconductor die of the at least two bare semiconductordie and the plurality of circuit traces of the substrate; and aplurality of electrical connectors located on the die side surface ofthe substrate for electrically connecting the substrate and anothersubstrate, the plurality of electrical connectors connected to theplurality of circuit traces.
 52. The electrical assembly of claim 51,wherein the plurality of electrical connectors between the attachmentsurface of the substrate and said another substrate comprises aplurality of solder balls.
 53. The electrical assembly of claim 51,wherein the plurality of electrical connectors between the attachmentsurface of the substrate and said another substrate comprises aplurality of pins.
 54. The electrical assembly of claim 51, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located in the substrate.
 55. The electricalassembly of claim 51, wherein the plurality of circuit traces comprise aplurality of circuit traces having at least one circuit trace of theplurality of circuit traces having a portion thereof located on theattachment surface of the substrate.
 56. The electrical assembly ofclaim 51, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the attachmentsurface of the substrate and a portion thereof located in the substrate.57. The electrical assembly of claim 51, wherein the plurality ofcircuit traces comprise a plurality of circuit traces having at leastone circuit trace of the plurality of circuit traces having a portionthereof located on the die side surface of the substrate.
 58. Theelectrical assembly of claim 51, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe die side surface of the substrate and a portion located in thesubstrate.
 59. The electrical assembly of claim 51, wherein thesubstrate comprises a printed circuit board.
 60. The electrical assemblyof claim 51, wherein the die substrate further includes a plurality ofbond pads connected to the plurality of circuit traces.
 61. Theelectrical assembly of claim 60, wherein the plurality of bond pads arelocated on the attachment surface of the substrate.
 62. The electricalassembly of claim 60, wherein the plurality of bond pads are located onthe die side surface of the substrate.
 63. The electrical assembly ofclaim 51, further comprising: a sealant located in a portion of saideach via of the at least two vias in the substrate for encasing at leasta portion of the plurality of bond wires.
 64. The electrical assembly ofclaim 51, further comprising: an adhesive attaching a portion of thesurface having a plurality of bond pads of said each bare semiconductordie of the at least two bare semiconductor die to the die side surfaceof the substrate having the plurality of bond pads of said each baresemiconductor die of the at least two bare semiconductor die located inthe at least two vias extending through the substrate from the die sidesurface to the attachment surface of the substrate.
 65. The electricalassembly of claim 64, wherein the adhesive comprises a sealing adhesive.66. The electrical assembly of claim 64, wherein the adhesive comprisesan adhesive tape.
 67. An electrical assembly for connection to asubstrate having a plurality of circuits comprising: a plurality of baresemiconductor die, each bare semiconductor die of said plurality of baresemiconductor die having a surface having a plurality of bond padslocated thereon; a substrate having a die side surface; an attachmentsurface, a plurality of vias extending through the substrate from thedie side surface to the attachment surface, a plurality of circuittraces, and at least one bond pad connected to at least one circuittrace of said plurality of circuit traces, a portion of the surfacehaving the plurality of bond pads of said each bare semiconductor die ofsaid plurality of bare semiconductor die for attaching to a portion ofthe die side surface of the substrate; a plurality of wire bondsextending through each via of the plurality of vias extending throughthe substrate from the die side surface to the attachment surfacethereof, the plurality of wire bonds for connecting the plurality ofbond pads of said each bare semiconductor die of said plurality of baresemiconductor die and the plurality of circuit traces of the substrate;and a plurality of electrical connectors located on the die side surfaceof the substrate for electrically connecting the substrate and anothersubstrate, the plurality of electrical connectors for connection to theplurality of circuit traces.
 68. The electrical assembly of claim 67,wherein the plurality of electrical connectors between the attachmentsurface of the substrate and said another substrate comprises aplurality of solder balls.
 69. The electrical assembly of claim 67,wherein the plurality of electrical connectors between the attachmentsurface of the substrate and said another substrate comprises aplurality of pins.
 70. The electrical assembly of claim 67, wherein theplurality of circuit traces comprise a plurality of circuit traceshaving at least one circuit trace of the plurality of circuit traceshaving a portion thereof located in the substrate.
 71. The electricalassembly of claim 67, wherein the plurality of circuit traces comprise aplurality of circuit traces having at least one circuit trace of theplurality of circuit traces having a portion thereof located on theattachment surface of the substrate.
 72. The electrical assembly ofclaim 67, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the attachmentsurface of the substrate and a portion thereof located in the substrate.73. The electrical assembly of claim 67, wherein the plurality ofcircuit traces comprise a plurality of circuit traces having at leastone circuit trace of the plurality of circuit traces having a portionthereof located on the die side surface of the substrate.
 74. Theelectrical assembly of claim 67, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe die side surface of the substrate and a portion located in thesubstrate.
 75. The electrical assembly of claim 67, wherein thesubstrate comprises a printed circuit board.
 76. The electrical assemblyof claim 67, wherein the substrate further includes a plurality of bondpads connected to the plurality of circuit traces.
 77. The electricalassembly of claim 76, wherein the plurality of bond pads are located onthe attachment surface of the substrate.
 78. The electrical assembly ofclaim 76, wherein the plurality of bond pads are located on the die sidesurface of the substrate.
 79. The electrical assembly of claim 67,further comprising: a sealant located in a portion of said each via ofthe plurality of vias in the substrate for encasing at least a portionof the plurality of bond wires.
 80. The electrical assembly of claim 67,further comprising: an adhesive attaching a portion of the surfacehaving a plurality of bond pads of said each bare semiconductor die ofsaid plurality of bare semiconductor die to the die side surface of thesubstrate having the plurality of bond pads of said each baresemiconductor die of said plurality of bare semiconductor die located inthe plurality of vias extending through the substrate from the die sidesurface to the attachment surface of the substrate.
 81. The electricalassembly of claim 80, wherein the adhesive comprises a sealing adhesive.82. The electrical assembly of claim 80, wherein the adhesive comprisesan adhesive tape.
 83. An electrical assembly for connection to asubstrate having a plurality of circuits comprising: a substrate; a baresemiconductor die having a surface having a plurality of bond padslocated thereon; a substrate having a die side surface, an attachmentsurface, a via extending through the substrate from the die side surfaceto the attachment surface, a plurality of circuit traces, and at leastone bond pad connected to at least one circuit trace of said pluralityof circuit traces, a portion of the surface having the plurality of bondpads of said bare semiconductor die for attaching to a portion of thedie side surface of the substrate; a plurality of wire bonds extendingthrough the via extending through the substrate from the die sidesurface to the attachment surface thereof, the plurality of wire bondsfor connection to the plurality of bond pads of the bare semiconductordie and the plurality of circuit traces; and a plurality of electricalconnectors located on the attachment surface of the substrateelectrically connecting the substrate and the substrate having a via,the plurality of electrical connectors for connection to the pluralityof circuit traces.
 84. The electrical assembly of claim 83, wherein theelectrical connection between the attachment surface of the substrateand said substrate comprises a plurality of solder balls.
 85. Theelectrical assembly of claim 83, wherein the electrical connectionbetween the attachment surface of the substrate and said substratecomprises a plurality of pins.
 86. The electrical assembly of claim 83,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located in the substrate.
 87. Theelectrical assembly of claim 83, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe attachment surface of the substrate.
 88. The electrical assembly ofclaim 83, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the attachmentsurface of the substrate and a portion thereof located in the substrate.89. The electrical assembly of claim 83, wherein the plurality ofcircuit traces comprise a plurality of circuit traces having at leastone circuit trace of the plurality of circuit traces having a portionthereof located on the die side surface of the substrate.
 90. Theelectrical assembly of claim 83, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe die side surface of the substrate and a portion located in thesubstrate.
 91. The electrical assembly of claim 83, wherein thesubstrate comprises a printed circuit board.
 92. The electrical assemblyof claim 83, wherein the substrate further includes a plurality of bondpads connected to the plurality of circuit traces.
 93. The electricalassembly of claim 92, wherein the plurality of bond pads are located onthe attachment surface of the substrate.
 94. The electrical assembly ofclaim 92, wherein the plurality of bond pads are located on the die sidesurface of the substrate.
 95. The electrical assembly of claim 83,further comprising: a sealant located in a portion of the via in thesubstrate for encasing at least a portion of the plurality of bondwires.
 96. The electrical assembly of claim 83, further comprising: anadhesive attaching a portion of the surface having a plurality of bondpads of the bare semiconductor die to the die side surface of thesubstrate having the plurality of bond pads of the bare semiconductordie located in the via extending through the substrate from the die sidesurface to the attachment surface of the substrate.
 97. The electricalassembly of claim 96, wherein the adhesive comprises a sealing adhesive.98. The electrical assembly of claim 96, wherein the adhesive comprisesan adhesive tape.
 99. An electrical assembly for connection to asubstrate having a plurality of circuits comprising: a substrate; aplurality of bare semiconductor die, each bare semiconductor die of saidplurality of bare semiconductor die having a surface having a pluralityof bond pads located thereon; a substrate having a die side surface, anattachment surface, a plurality of vias extending through the substratefrom the die side surface to the attachment surface, a plurality ofcircuit traces, and at least one bond pad connected to at least onecircuit of said plurality of circuits, a portion of the surface havingthe plurality of bond pads of said each bare semiconductor die of saidplurality of bare semiconductor die for attaching to a portion of thedie side surface of the substrate; a plurality of wire bonds extendingthrough each via of the plurality of vias extending through thesubstrate from the die side surface to the attachment surface thereof,the plurality of wire bonds for connecting the plurality of bond pads ofsaid each bare semiconductor die of said plurality of bare semiconductordie and the plurality of circuit traces of the substrate; and aplurality of electrical connectors located on the die side surface ofthe substrate for electrically connecting the substrate and thesubstrate having a via, the plurality of electrical connectors connectedto the plurality of circuit traces.
 100. The electrical assembly ofclaim 99, wherein the plurality of electrical connectors between theattachment surface of the substrate and said substrate comprises aplurality of solder balls.
 101. The electrical assembly of claim 99,wherein the plurality of electrical connectors between the attachmentsurface of the substrate and said substrate comprises a plurality ofpins.
 102. The electrical assembly of claim 99, wherein the plurality ofcircuit traces comprise a plurality of circuit traces having at leastone circuit trace of the plurality of circuit traces having a portionthereof located in the substrate.
 103. The electrical assembly of claim99, wherein the plurality of circuit traces comprise a plurality ofcircuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the attachmentsurface of the substrate.
 104. The electrical assembly of claim 99,wherein the plurality of circuit traces comprise a plurality of circuittraces having at least one circuit trace of the plurality of circuittraces having a portion thereof located on the attachment surface of thesubstrate and a portion thereof located in the substrate.
 105. Theelectrical assembly of claim 99, wherein the plurality of circuit tracescomprise a plurality of circuit traces having at least one circuit traceof the plurality of circuit traces having a portion thereof located onthe die side surface of the substrate.
 106. The electrical assembly ofclaim 99, wherein the plurality of circuit traces comprise a pluralityof circuit traces having at least one circuit trace of the plurality ofcircuit traces having a portion thereof located on the die side surfaceof the substrate and a portion located in the substrate.
 107. Theelectrical assembly of claim 99, wherein the substrate comprises aprinted circuit board.
 108. The electrical assembly of claim 99, whereinthe die substrate further includes a plurality of bond pads connected tothe plurality of circuit traces.
 109. The electrical assembly of claim108, wherein the plurality of bond pads are located on the attachmentsurface of the substrate.
 110. The electrical assembly of claim 108,wherein the plurality of bond pads are located on the die side surfaceof the substrate.
 111. The electrical assembly of claim 99, furthercomprising: a sealant located in a portion of said each via of theplurality of vias in the die substrate encasing at least a portion ofthe plurality of bond wires.
 112. The electrical assembly of claim 99,further comprising: an adhesive attaching a portion of the surfacehaving a plurality of bond pads of said each bare semiconductor die ofsaid plurality of bare semiconductor die to the die side surface of thesubstrate having the plurality of bond pads of said each baresemiconductor die of said plurality of bare semiconductor die located inthe plurality of vias extending through the substrate from the die sidesurface to a second attachment surface of the substrate.
 113. Theelectrical assembly of claim 112, wherein the adhesive comprises asealing adhesive.
 114. The electrical assembly of claim 112, wherein theadhesive comprises an adhesive tape.